Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f26ecd2634001bd…

MALICIOUS

PDF

75.9 KB Created: 2021-03-17 01:53:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 49e5026b48ef938026d3a94f73250071 SHA-1: a2426a4970194bed1a92e9fd18a85619e3b68ca9 SHA-256: 4f26ecd2634001bde2fece4ca38d63ee53d31c66578903a32c0cb24e83286405
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lozipotod.ru/award?keyword=astm+a370+14+pdf PDF link annotation
    • https://xevulesej.weebly.com/uploads/1/3/0/8/130874496/4078508.pdfIn PDF document text
    • https://bigorofepomibed.weebly.com/uploads/1/3/4/4/134400252/wejifuf.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/hchghew/glockmeister_build_a_glock.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/jKhbig2/24101254789.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wulotugadag/axa_ppp_core_dental_claim_form.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/fusudifepuzusasefaj.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_325bddf6feb24b53a5c764765538802e.pdf?index=trueIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_98a100e601594ecb9e89d7074f90b45e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fipijife/91633542896.pdfIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_2dc775b891bd4a1a922aa910e192eeb4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/indian_bangla_movie_manik_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/lean_six_sigma_for_dummies_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/61247548961.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/15891902051.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/gegopematowi.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/gokejemudituvibevewixo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 4980 bytes
SHA-256: 4c29d12bf8cdd6377f17e79c4c40097808c3ec5c7689a4e25d3058347486f1cf
font_01_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 10096 bytes
SHA-256: d2ed734286cf1913a84b3ff4325ce0da274afe07e05f699aeb64ae3ad62ed627
font_02_sfnt_off000114b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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